It's simple but; pls help asap

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

Solve this problem! extra ! 3025/5.5 = a/90.75